Wow, theres definitely some falsities being thrown around about gas, octane. Reefraff, crash, and stdr are right though, thanks for reading guys.
Lastly, octane is not an 8 carbon ring. In fact the particular octane in gasoline, i.e. octane number is iso-octane (CH3)3CCH2CH(CH3)2. Furthermore, cycloalkanes are actually pretty damn volatile, high chem. potential, fugacity, and activity. Although convential organic theory stipulates increased stability due to resonance effects, this is the very same reason they can be so volatile with trivalent compounds.